Line a slice tin with baking paper.
In a microwave safe bowl melt 350grams of the while chocolate, butter and golden syrup. Cook in 30 second bursts stirring after each session. Don't be tempted to cook for longer or you will risk burning the chocolate. Let it sit for about 5 minutes to cool slightly
Add chopped shortbread biscuits, marshmallows and 1 of the Kit Kat blocks (chopped) and mix well.
Fill your prepared tin with the mixture and smooth the top. Place in refrigerator.
Roughly chop the second Kit Kat chocolate block and set aside. Melt the remaining 150grams of chocolate in the microwave as above.
Remove the rocky road from the fridge and pour the melted chocolate over the top and spread to ensure it covers the whole thing, then top with your chopped Kit Kat.
Place back in the refrigerator until set (approximately 2hrs). Remove and chop into small pieces.
Can be frozen for up to a month and kept in the refrigerator for a week.
